3 Answers
3

That staby-synth chord sounds like a PDX PCM wav file, probably synclavier that is used to additively synthesize a jazzy piano chord, MDX is all fm synthesis, any other sounds in the track that are not PDX you can use some kind of tool to get that out of the track and convert the format to an fm patch you can use with vopm or fm8...this way you can also study it and understand how it is made.

try sample reduction and 8 bit bit crunching it, like the emulator does to save disk space on the game storage devices that used to be very limited back then...your sample missing all that high end crunch and noise with aliasing distortion...back then they used to add noise then sample reduce the audio to save space on the storage device...experiment by adding white noise then running it through plugins such as chip crusher or d16 decimort, or even better if you have an vintage sampler such as an emu or an akai sampler where you can samplereduce it, make sure you add highpassed whitenoise.
– textureApr 28 '15 at 3:48

I'm wondering if a little high-pass filtering would get you closer to your goal. The dropbox sound has a considerable thud in it not at all present in the first link.
– Phil FreihofnerJun 17 '18 at 4:10

The base of the waveform consists of sinewaves and peekwaves. There is very complex chord progression at work with 30+ voices spanning over several octaves.

I used the free Tone2 Firebird Synthesizer to recreate the sound. 2 Oscillators are at work. Base are two simple sinewaves, one at base, and one transformed by an octave, both mono & no effects. The second layer is a Peekwave transformed up by two octaves. Half of the peekwave is mono and without effects, the other half has some fatness, analog dirt & ensemble effects to add some Stereo depth to the sound. After filtering, the result underwent some equalizing and a special Spatial effect Plug-In.

It sounds incomplete in my opinion but I didn't want to make it overly complex and I have only used Plugins that are freeware. You should be able to recreate this file and work from there. You can read all settings from the video. Here is the final product:

It sounds clearly different from the original but the chords are correct. Just replace the Peekwave with your own Piano Synth.

I forgot to show the chords in the video. Unfortunately I couldn't get more than 12 voices at the same time with my Keyboard Plug-In: